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Fractional Distillation

Question

Oxygen is manufactured by the fractional evaporation of :
water
liquid oxygen
liquid air
hydrogen peroxide

A

hydrogen peroxide

B

water

C

liquid air

D

liquid oxygen

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Solution

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Oxygen is manufactured by the fractional evaporation of liquid air. In this commercial method, the air is liquefied by using the Joule-Thomson effect. Water vapor and carbon dioxide are removed by solidification. Liquid oxygen (boiling point $- 183^{o} C$ ) is separated from liquid nitrogen (boiling point $- 195.8^{o} C$ ) by fractional distillation.

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